Pressure device for electric metal-working apparatus.



Patented Dec. 31, 1912.

2 SHEETSSHEET 1.

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WWI m M T k 1 M 7 v :11: H 5 m 0 ///E m om m .J wfiwwfivk E I w I I 1 I I l l A. F. RIETZEL. PRESSURE DEVICE FOR ELECTRIC METAL WORKING APPARATUS.

A. F. RIBTZEL. Y rnnssnnz DEVICE ran ELECTRIC METAL WORKING APPARATUS.

APPLICATION FILED 11113.14, 1910.

Patented Dec. 31, 1912. IO 2 SWTB-SFEET 2.

"flmmlllll 6' O 6 IIIIH ADOLPH r. nrn'rznn, or 'cHAnLns'rowN,

nnonn ISLAND, ASSIGNOR r THOMSON ELECTRIC WELDING COMPANY, OF LYNN, MASSACHUSETTS, A CORIPORATION OF MASSACHUSETTS.

PRESSURE DEVICE FOR ELECTRIC METAL-WORKING APPARATUS.

Specification of Letters Patent. Application filed March 14,

1910. Serial No. 549,207.

To all whom it may concern:

Be it known that I, ADOLPH F. RIETZEL, a citizen of the United States, and a resident of Charlestown, in the county of Washington and State of Rhode Island, have invented certainv new and useful Improvements in Pressure Devices for Electric Metal-Working Apparatus, of which the following is a specification.

My present invention relates to electric metal working apparatus and more particularly to pressure devices for that type of such apparatus wherein a current of electricit is employed. to soften the work at the esired location and pressure applied to effect a weld or otherwise work the metal.

My present invention is particularly, useful when employed in a paratus designed for welding or uniting t e free ends of a 0 ring together but other uses to which the invention might be putwill be readily understood by those skilled in the art by reading the subjoined description, and my invention will be described as carried into.

5 efiect in a machine of this character; but it will be understood that it is not limited to this use as it might be employed for various other uses without departing from the spirit of the invention.

The object of my invention is to provide l means for applying the necessa upsetting pressure to rings or other simi ar, sections of metal to be welded or otherwise worked upon the softening of the same due to the,

passage of a heatinlgl current of electricity whereby the ring w' not become distorted or out of true owing to this application of pressure. j

Heretofore, it has been customary 1'11 0 welding rings to ap lly the weldin pressure b means of the wor -holder's whic support I e work by engaging opposite sides of the ring. By these means the pressure is ap-" plied over the entire sides and as the work 46 softens and yields, the 'work-holders'pushup and upset the work, the result being-a flattening or distortion of the finished ring.

This occasions an additional operation to' true=up the ring in cases where aperfect 50 ringpr circle is desired. When operatlng';

on rings of a small gage metal the distor- .tion is not so apparent as the work lhas to upset'very little, but where heavy r ngs are worked, the upsetting is greater and the distortion consequently increases.

By practising my invention, the work holders supporting the work bring the free ends in contact and separate pressure devices are provided which apply pressure to the heated section only in line therewith. The invention consists in the combination in a ring welding machine of work-holders and separate pressure devices which apply pressure upon the softening of the work substantially only in line with the weld.

The invention also consists in-the combinations of parts and details of construction hereinafter more particularly described and then specified in the claims.

In the accompanying drawings, Figure 1 is a plan of apart of an electric welding" machine having my invention applied thereto. Fig. 2 is a front elevation of the same. Fig. 3 is a plan of the work-holders and pressure devices with the work inserted therein. Fig.4 is asimilar view after the Patented Dec. 31,1912

ends of the ring have been forced together. Fig. 5 is an enlarged transverse ,s'ect'ionj taken on the line X- X Fig. 1. Fig. 6'is an enlarged section taken onthe line Y. Y Fig.

1. Figs. 7 and 8 are plan and elevation res' ectively of one work-holder detached from t e rest of the apparatus. Figs. 9- and 10 are plan and elevationrespectively of thepressure jaw detached from the apparatus.

Referring to the drawings, 1 indicates the I table or platform of the machine upon which the various parts are mounted and supported.

2 and 3 indicate slides or work-holder bases suitably mounted in'guides's'ecured to the table 1, either or both of which may be movable. to and awa from each other by any suitable and wel -known means as will .be readily. understood bythose skilled in the" electricmetal working art. Preferably. the. slid' Q is fixed but capable of longitudinal-'- adjustment by,means of adjusting screw 414 and the slide-3 movable to -and away from',

the slide 2 b any well known means.

5 and '6'in icate the two work-holders can.

ried by and suitably secured to the bases or work, indicated at 7, is supported. .The-

slides 2,?) respectively. These work-holders arepreferably recessed to form a depository curvature of the Walls 8 of the recessed portions of the work-holders which grip and 'hold the ring is made the exact size and curve of the outer periphery of the finished ring so that after the ring is upset upon the softening of the metal itwill coincide with the/walls 8 which in a manner determine the size of" the finished ring. To allow for different sized or shaped rings, the workholders 5, 6 are readily detachable from their bases by removing nuts 9 so as to be replaced by others of dilferent shaped recesses or parts which grip the work.

' l0 and 11 indicate sliding blocks mounted to slide in suitable guides formed on the bases or slides 2, 3. The said blocks'lO and 11 are free to slide longitudinally on the bases '2, 3 independent of the movement of said bases, the movement thereof being limited in either direction by a .-pin 12 secured to the base workin in a slot formed in the supplementary slide. .These slides 10 and 11 provide the necessary upsetting pressure and are each provided with a workengaging jaw 13, 14 respectively. These jaws engage the periphery of the rim at eitherside of the weld or section of metal to be heated, the end ofeachljaw being recessed as at 15 and rovided with a workengaging face 16 wh1ch engages and presses- .thejaws 13 and 14. The said jaws are also preferably replaceable to handle different forms of metal'to be worked;

The heating electric current may be applied'to the. work in any desired manner as for instance through a pair of contact jaws 19, 20- connected with the source of current" and adapted to close upon the work on either side of the section to be welded and between the pressure jaws 13,14. Electric current is supplied to the contacts 19, 20 in any suitableimanner, all as well-known to those skilled in the electric metal working art and as the particular manner of supplying current forms no part of my present invention, further description will be dispensed with.

K In the operation of the apparatus the ring 7 is placed in .the recesses of the workholders 6, 6. and also rests in the recesses of the pressure jaws 13 and 14. The workhplder base or'slide 3 is then forced toward its-companion slide 2 which butts the free 69, ends of the ring a ainst each other. 'As the ringis. somewhat ar er in, diameter in this stage'than when finis ed, the pressure jaws 13, =14 are forced backward and the springs 17 further compressed. After. the heating curre'nt is permitted to flow through the work and the work softens, the jaws 13 and 14 are pushed forward by the springs 17 and the metal at the point of Weld upset and finally welded together due to the pressure of the said jaws, the work-engaging faces 16 of the pressure jaws sliding on the ,periphery of the ring and applying the pressure substantially in a line with the weld whereby distortion of the ring is avoided, which distortion would take place were a general endwise pressure applied to the entire ring.

Itwill be understood that my invention is not limited to the various details and arrangements shown and described but varibus departures therefrom might be employed without departing from the spirit of this invention" as set forth and contemplated in the appended claims.

What I claim as my invention is:

1. In an electric metal working apparatus, the combination of work-holders for supporting and gripping. the work and independently movable pressure devices carriedby said work-holders and adapted to apply welding pressure to the work in line with the softened part thereof.

2. In an electric metal workingapparatus, the combination of work-holders for supporting and gripping the, work and springactuated pressure devices carried by said work-holders and adapted to apply welding pressure to the work only in line desiredweld.

3. In an electric metal working apparatus,

toward and away from each other and pressure jaws movable in guides on said workholders and adapted to apply upsetting pres sure to the work in line with the weld.

4:. In an electric metal working apparatus,

with the the combination of work-holders movablel the combination of work-holders movable toward and away from each other and spring-actuated pressure jaws carried by said work-holders and independently movable thereon to apply upsetting pressure as the work softens.

' 5. In an electric metal working apparatus, the combination of work-holders movable toward and away from each other, pressure jaws adapted to engage the work substantially in line with the weld and movable independent of said work-holders and springs engage the periphery of the ring substan- 1:

tially in line with the weld and movable 001-- w'ard each other independentof the workholders and springs for applying welding or upsetting pressure to sa' aws independent 0 the movement of the workholders.-

7. In a ring welding machine, the combination of work-holders adapted to support the ring to be welded in a horizontal plane and independently movable pressure devices adapted to apply pressure to said ring only in a longitudinal line with the weld.

8. In a ring welding machine, the combination of work-holders adapted to engage and support the ring in a horizontal plane and independently movable ressure. jaws adapted to grip said ring su stantially in longitudinal line with the desiredweld.

9, In an electric metal working appa I ratus, the combination of work-holders movable toward and away from each other and v apply the welding or upsetting pressure to 20 the work.

Signed at Stonington in the county of New London and State of Conn.

ADOLPH RIETZEL.

Witnessesz' M.. NETIIE MARTIN, v Rosa H. Rm'rznn. 

